<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>姓名案例_computed实现</title>
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
    <div id="root">
        姓：<input type="text" v-model="firstName"><br/><br/>
        名：<input type="text" v-model="lastName"><br/><br/>
        姓名：<span>???????</span>

    </div>
</body>
<script type="text/javascript">
    Vue.config.productionTip = false
    new Vue({
        el:'#root',
        data:{
            firstName:'张',
            lastName:'三'
        },
    })


</script>

</html>